mirror of
https://github.com/moparisthebest/Conversations
synced 2024-12-04 22:52:19 -05:00
46f147a82c
Conflicts: .gitignore CHANGELOG.md README.md libs/MemorizingTrustManager libs/minidns libs/openpgp-api-lib
162 lines
4.9 KiB
Java
162 lines
4.9 KiB
Java
/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package eu.siacs.conversations.utils;
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import android.util.Log;
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import java.io.IOException;
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import java.io.InputStream;
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public class ExifHelper {
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private static final String TAG = "CameraExif";
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public static int getOrientation(InputStream is) {
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if (is == null) {
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return 0;
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}
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byte[] buf = new byte[8];
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int length = 0;
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// ISO/IEC 10918-1:1993(E)
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while (read(is, buf, 2) && (buf[0] & 0xFF) == 0xFF) {
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int marker = buf[1] & 0xFF;
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// Check if the marker is a padding.
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if (marker == 0xFF) {
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continue;
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}
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// Check if the marker is SOI or TEM.
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if (marker == 0xD8 || marker == 0x01) {
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continue;
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}
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// Check if the marker is EOI or SOS.
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if (marker == 0xD9 || marker == 0xDA) {
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return 0;
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}
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// Get the length and check if it is reasonable.
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if (!read(is, buf, 2)) {
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return 0;
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}
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length = pack(buf, 0, 2, false);
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if (length < 2) {
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Log.e(TAG, "Invalid length");
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return 0;
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}
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length -= 2;
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// Break if the marker is EXIF in APP1.
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if (marker == 0xE1 && length >= 6) {
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if (!read(is, buf, 6)) return 0;
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length -= 6;
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if (pack(buf, 0, 4, false) == 0x45786966 &&
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pack(buf, 4, 2, false) == 0) {
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break;
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}
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}
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// Skip other markers.
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try {
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is.skip(length);
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} catch (IOException ex) {
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return 0;
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}
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length = 0;
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}
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// JEITA CP-3451 Exif Version 2.2
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if (length > 8) {
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int offset = 0;
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byte[] jpeg = new byte[length];
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if (!read(is, jpeg, length)) {
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return 0;
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}
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// Identify the byte order.
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int tag = pack(jpeg, offset, 4, false);
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if (tag != 0x49492A00 && tag != 0x4D4D002A) {
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Log.e(TAG, "Invalid byte order");
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return 0;
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}
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boolean littleEndian = (tag == 0x49492A00);
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// Get the offset and check if it is reasonable.
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int count = pack(jpeg, offset + 4, 4, littleEndian) + 2;
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if (count < 10 || count > length) {
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Log.e(TAG, "Invalid offset");
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return 0;
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}
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offset += count;
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length -= count;
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// Get the count and go through all the elements.
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count = pack(jpeg, offset - 2, 2, littleEndian);
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while (count-- > 0 && length >= 12) {
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// Get the tag and check if it is orientation.
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tag = pack(jpeg, offset, 2, littleEndian);
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if (tag == 0x0112) {
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// We do not really care about type and count, do we?
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int orientation = pack(jpeg, offset + 8, 2, littleEndian);
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switch (orientation) {
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case 1:
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return 0;
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case 3:
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return 180;
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case 6:
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return 90;
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case 8:
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return 270;
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}
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Log.i(TAG, "Unsupported orientation");
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return 0;
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}
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offset += 12;
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length -= 12;
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}
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}
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Log.i(TAG, "Orientation not found");
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return 0;
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}
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private static int pack(byte[] bytes, int offset, int length,
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boolean littleEndian) {
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int step = 1;
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if (littleEndian) {
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offset += length - 1;
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step = -1;
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}
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int value = 0;
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while (length-- > 0) {
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value = (value << 8) | (bytes[offset] & 0xFF);
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offset += step;
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}
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return value;
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}
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private static boolean read(InputStream is, byte[] buf, int length) {
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try {
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return is.read(buf, 0, length) == length;
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} catch (IOException ex) {
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return false;
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}
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}
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}
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